guilds



(No Model.) v W. H. H. OHILDS.

MANUPAGTURE OP ROOFING FELT. v No. 314,429. Patented. Mar. 24, 1885.

N. PETERS. Pholo-Llihugmpher. Washington. D. c.

FFlCE.

\VILLIAM H. H. CHILDS, OF NEXV YORK, N. Y.

MANUFACTURE OF ROOFING-FELT.

SPECIFICATION forming part of Letters Patent E\lo.311 l=29,dated March24, 1885.

Application filed January 12, 18s.).

T 0 all whom it may concern.-

Be it known that I, W. H. H. CHILDS, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented certain new and useful Improvements in the Manufacture ofRoofing-Felt, of which the following is a specification, reference beinghad therein to the accompanying drawing.

My invention relates to improvements in the manufacture of roofing-felt.

The object of my invention is to treat the felt as it leaves the machinewhich deposits the bituminous cement between the layers of felt so thatthe felt can be rolled up at once without danger of adhering.

Myinvention consists in treating the felt as it leaves the machine to ahot chemical solution which will neutralize or remove the sticky depositon the surface of the felt, so that the felt can be rolled up at oncefor transportation.

In the drawing forming a part of this specification I have shown insectional view a tank having therein a coil of pipes for heating thesolution and a roller in the bottom thereof, under which the felt isdrawn after it leaves the machine.

In the manufacture of roofing material composed of two or more plies offelt joined together with tar, pitch, rosin, asphaltum, or anycomposition of a bituminous nature, great difficulty has beenexperienced in preventing the felt from adhering together when rolled-up for shipment, and to overcome this difficulty many devices andexpedients have been resorted to; but none of them have provedsatisfactory or meet the requirements of the case. It has been proposedto place between the roofing-felt as it is being rolled up a sheet ofuntarred paper; but this, while being an expensive expedient, does notalways answer the purpose desired, as the felt adheres to both sides ofthe 'untarred paper and cannot be unrolled. Again, it has been proposedto cool the felt after leaving the machine which deposits the adheringlayers of bituminous cement between the webs or layers of felt bybringing it in contact with currents of cold air or water. This processhas the effect of chilling and hardening the coal-tar or bituminous cem-(No model.)

ent which has been driven through onto the outer surface of the felt, sothat it is possible to roll the felt into rolls without its adhering atonce; but in course of time, and when subjected to the ordinarytemperature of warm weather or summer heat, the coal-tar or bituminouscement becomes soft and causes the layers to adhere together, so thatthey cannot be unrolled when desired for use. I effectually andeconomically overcome this difficulty by my process, which will bedescribed hereinafter.

My invention is specially applicable in the manufacture of the rootingmaterial known as two and three ply felts, in which hot pitch orbituminous compounds are placed between the sheets of felt, which hasbeen previously tarred, as is the common practice. The heat of the pitchor other bituminous composition causes the felt to sweat and depositupon its surface a sticky tarry substance, which unites the felt closelywhen the surfaces come in con-- tact on being rolled up.

To neutralize and remove the sticky adhesive deposit upon the surface ofthe felt is the object of my invention. This I do in the followingmanner at small expense and without injury to the fabric of the felt.

After the material, whether composed of two, three, or four plies offelt, has been formed upon the machine by any'proeess whatever, Ichemically treat it by passing it through a hot solution of soda or milkof lime, or a combination of the two. These I have found to give goodresults in neutralizing or dissipatin g the sticky substance formed onthe surface of the felt, as before mentioned, so that the felt can berolled up at once as soon as it emerges from the bath. In some instancesI may mix with the solution above named hydraulic cement or anysubstance which will For this purpose I provide a tank or vat, A, inwhich there is placed one or more coils of steam-pipes, B, the steambeing admitted at the top or point C, while the Water of condensationfinds its exit from the pipe at D.

E is a roller, mounted in suitable standards,

F, at each side of the tank, under which the fabric Gpasses and issubmerged in the chemt cal solution contained in the tank or vat A. Thetank or vatA is also provided with friction-rollers H, which prevent thefabric from becoming injured by coming in contact with the walls of thetank.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

1. The method herein described of making roofing-felt, the sameconsisting in subjecting the felt to a chemical solution. substantiallysuch as described, whereby the surfaces are freed from the sticky oradhesive substance, as set forth.

2. The method herein described of manufacturing roofing-felt, the sameconsisting in subjecting the felt as it leaves the machine to' 25 a hotsolution of soda and milk of lime or their described equivalents, as setforth.

3. The method herein described of treating roofing-felt to prevent itsadhering together when formed in rolls, the same consisting in 50subjecting it, after it leaves the machine which joins the several feltsinto one, to a hot chemical solution of soda, milk of lime, and bydraulic cement or other material whichwill deposit a powder on the felt,as set forth.

In testimony whereof I have affixed my signature in presence of twoWitnesses.

' \VILLIAM H. II. CHILDS.

Witnesses:

J. B. DAVENPORT, R. J. SLANDonFF.

